"midriff" in the noun sense
1. middle, midriff, midsection
the middle area of the human torso (usually in front
"young American women believe that a bare midriff is fashionable"
2. diaphragm, midriff
anatomy) a muscular partition separating the abdominal and thoracic cavities functions in respiration
Source: WordNet® (An amazing lexical database of English)
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